Предмет: Геометрия, автор: JellyBe1

Помогите! Почему так?
_______ _
O1N = √(r2+r1)²-(r2-r1)²=√4r1r2

JellyBe1: Танда ты там скоро?

Ответы

Автор ответа: Tanda80

2

Решение на фотографии.
Раскрываем квадрат суммы и разности по формулам сокращенного умножения.

Приложения:

JellyBe1: Спасибо

Tanda80: Пожалуйста.

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